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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ (19) $ 27 $ (29) $ 68
Other comprehensive income (loss):        
Foreign currency translation adjustments 13 18 (26) 1
Comprehensive income (loss) $ (6) $ 45 $ (55) $ 69